I have 4 PayPal feeds, each with a different price and purpose. When checking out using a PayPal enabled form the product that shows on PayPal seems to be randomly chosen between all the feeds.
Sometimes the correct product shows in PayPal and sometimes it is the product from one of the other feeds.
My issues seems to be similar to this one but subtly different:
PayPal is receiving an amount it's just not always the correct amount.
PayPal (showing the PayPal feed for another product):